State profile · Near national median SD

New Hampshire bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in New Hampshire — drawn straight from the FHWA National Bridge Inventory.

2,542
Public bridges
43.0%
Good condition
7.1%
Poor condition
7.1%
Structurally deficient

Total Bridges

2,542

Public highway bridges in New Hampshire

Good Condition

43.0%

1,092 bridges rated 7-9

-7.0pp vs 50% benchmark

Poor Condition

7.1%

180 bridges rated 0-4

Structurally Deficient

7.1%

180 bridges flagged for repair priority

0.1pp vs national avg 7.0%

New Hampshire vs national bridge condition

New Hampshire — Good condition share 43.0%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

New Hampshire — Structurally deficient share 23.6%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Bridge inventory deck-condition mix — New Hampshire (FHWA NBI)

New Hampshire42.95830055074744%35.641227380015735%GoodFairPoorStructurally Deficient
Bridge inventory deck-condition mix — New Hampshire (FHWA NBI)

Counties (10)

Belknap 112 Carroll 193 Cheshire 192 Coos 188 Grafton 544 Hillsborough 385 Merrimack 326 Rockingham 308 Strafford 136 Sullivan 158

New Hampshire vs nearby ranks

Adjacent states on the structurally deficient leaderboard (lower share = better)

States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below New Hampshire on the same metric.

36

New York

6.90% top marginal rate
Structure
Progressive
Burden @ $100K
$19,132

21

Kentucky

7.06% top marginal rate
Structure
Progressive
Burden @ $100K
$14,554
Selected

33

New Hampshire

7.08% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

40

Oklahoma

7.50% top marginal rate
Structure
Progressive
Burden @ $100K
$22,733

35

New Mexico

7.61% top marginal rate
Structure
Progressive
Burden @ $100K
$368

Bridges Needing Most Attention in New Hampshire

Six lowest-condition bridges in New Hampshire, ranked by composite NBI rating. Each is inspected at least every 24 months.

OLD DEERFIELD ROAD

Poor

Over: BROOK

185 FT FROM NH RTE 43, Rockingham, NH

Built 1920 Load: 1.8 t ADT: 190

TEMPLETON TURNPIKE

Structurally Deficient

Over: PRIEST BROOK

1.9MI. RTE 119, Cheshire, NH

Built 1984 Load: 2.7 t ADT: 86

DUDLEY ROAD

Structurally Deficient

Over: LAMPREY RIVER

.23 MI JCT 101, Rockingham, NH

Built 1914 Load: 2.9 t ADT: 535

SHOP ROAD

Structurally Deficient

Over: NEEDLE SHOP BROOK

0.8 MI N NEW CHESTER RD, Merrimack, NH

Built 1930 Load: 3.3 t ADT: 63

WHITCOMB MILLS RD

Poor

Over: WHITE BROOK

0.06 MI FR ARCH ST, Cheshire, NH

Built 1940 Load: 3.6 t ADT: 814

LEIGHTON MEADOW RD

Structurally Deficient

Over: PHILLIPS BROOK

100 FT FR SULLIVAN RD 61, Coos, NH

Built 1940 Load: 3.6 t ADT: 90

All Bridges in New Hampshire

NEWBURY ROAD

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Grafton, NH

Built 1970 Load: 40.5 t ADT: 2,094

NH101 EB

Fair

Over: LAMPREY RIVER

.1 MI RAYMOND T.L., Rockingham, NH

Built 1963 Load: 40.5 t ADT: 22,645

GARAGE WAY

Fair

Over: SALMON FALLS RIVER

NH-ME SL, Strafford, NH

Built 1950 Load: 40.5 t ADT: 2,320

I-93 SB

Fair

Over: US 3

0.2 MI CAMPTON TL, Grafton, NH

Built 1968 Load: 40.6 t ADT: 7,703

NH 12,NH123

Fair

Over: COLD RIVER

.1MI FROM JCT RT 123, Cheshire, NH

Built 1960 Load: 40.8 t ADT: 5,983

JEFFERSON NOTCH RD

Fair

Over: S BRANCH ISRAEL RIVER

1.7 MI S JEFFERSON TL, Coos, NH

Built 1934 Load: 40.8 t ADT: 90

VT105,BRIDGE ST

Fair

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Coos, NH

Built 1947 Load: 40.8 t ADT: 1,113

TUNNEL STREAM ROAD

Fair

Over: TUNNEL BROOK

.7 MI FR EASTON TL, Grafton, NH

Built 1928 Load: 40.8 t ADT: 57

NH 3A

Fair

Over: SMITH RIVER

HILL BRISTOL TL, Grafton, NH

Built 1940 Load: 40.8 t ADT: 2,570

NH175

Fair

Over: WINTER BROOK

6.2 MI N JCT US 3, Grafton, NH

Built 1974 Load: 40.8 t ADT: 1,912

NH 10A,WHEELOCK ST

Fair

Over: CONNECTICUT RIVER

0.1 MI FROM VERMONT SL, Grafton, NH

Built 1998 Load: 40.8 t ADT: 11,311

TUTTLE HILL ROAD

Fair

Over: ORANGE BROOK

0.16 MI FR ORANGE RD, Grafton, NH

Built 1995 Load: 40.8 t ADT: 118

RAMP H

Fair

Over: FEE TPK

AT EXIT 2, Hillsborough, NH

Built 1993 Load: 40.8 t ADT: 8,802

SPRING ROAD

Fair

Over: NUBANUSIT BROOK

0.2 MI FR DUBLIN TL, Hillsborough, NH

Built 1940 Load: 40.8 t ADT: 226

ISAAC FRYE HIGHWAY

Fair

Over: SOUHEGAN RIVER

.14 MI SE JCT 31, Hillsborough, NH

Built 1993 Load: 40.8 t ADT: 838

NH 3A

Fair

Over: NEEDLE SHOP BROOK

1.4 MI FROM FRANKLIN, Merrimack, NH

Built 1940 Load: 40.8 t ADT: 2,612

NH108,NH111,NH 27

Fair

Over: EXETER RIVER

.1 MI FROM JCT RT 101C, Rockingham, NH

Built 1934 Load: 40.8 t ADT: 16,688

NH156

Fair

Over: PAWTUCKAWAY RIVER

.5 MI. N. RAYMOND TL, Rockingham, NH

Built 1942 Load: 40.8 t ADT: 3,238

NH 16,SP TPK NB

Fair

Over: BMRR

.4 MI. FROM JCT RT 9, Strafford, NH

Built 1957 Load: 40.8 t ADT: 22,053

NH 12,NH103

Fair

Over: SUGAR RIVER

3.8 MI FROM VERMONT SL, Sullivan, NH

Built 1996 Load: 40.8 t ADT: 6,023

NH 10

Fair

Over: GUNNISON BROOK

1.78 MI N LEMPSTER TL, Sullivan, NH

Built 1975 Load: 40.8 t ADT: 2,767

WINN HILL ROAD

Fair

Over: SUGAR RIVER

2.1 MI. CROYDON TL, Sullivan, NH

Built 1910 Load: 41.1 t ADT: 90

NH109

Fair

Over: SHANNON BROOK

3.3 MI FROM TUFTONBORO TL, Carroll, NH

Built 1929 Load: 41.2 t ADT: 3,457

NH 13,NH114

Fair

Over: PISCATAQUOG RIVER

.3 MI S JCT RT 13, Hillsborough, NH

Built 1928 Load: 41.2 t ADT: 13,265

ELM STREET

Fair

Over: NUBANUSIT BROOK

0.04 MI FR MAIN ST, Hillsborough, NH

Built 2003 Load: 41.2 t ADT: 2,297

I-89 SB

Fair

Over: WARNER RIVER

1.0 MI HOPKINTON TL, Merrimack, NH

Built 1966 Load: 41.3 t ADT: 10,378

I-89 NB

Fair

Over: WARNER RIVER

1.0 MI HOPKINTON T.L., Merrimack, NH

Built 1966 Load: 41.3 t ADT: 10,031

BEAR NOTCH ROAD

Fair

Over: SWIFT RIVER

.35 MI NORTH JCT 112, Carroll, NH

Built 1961 Load: 41.5 t ADT: 975

US302

Fair

Over: AMMONOOSUC RIVER

4.46 MI E JCT US 3, Coos, NH

Built 1987 Load: 41.5 t ADT: 3,804

DEPOT ROAD

Fair

Over: S BR PISCATAQUOG RIVER

3.8 MI N OF VERNON TL, Hillsborough, NH

Built 1993 Load: 41.5 t ADT: 107

GARLAND ROAD

Fair

Over: BUNNEL BROOK

0.5 MI FR MCGARY ROAD, Coos, NH

Built 1981 Load: 41.7 t ADT: 90

DODGE ROAD

Fair

Over: PETTYBORO BROOK

1.5 MI FR LISBON TL, Grafton, NH

Built 1972 Load: 41.7 t ADT: 235

CHAMBERLAIN ROAD

Fair

Over: CONTOOCOOK RIVER

OFF HADLEY STATION ROAD, Cheshire, NH

Built 1950 Load: 41.8 t ADT: 50

LINDEN STREET

Fair

Over: EXETER RIVER

1.36MI. RTE 111, Rockingham, NH

Built 1993 Load: 41.8 t ADT: 504

I-89, NH 10 NB

Fair

Over: I-89 RAMP

0.1 MI FROM ENFIELD TL, Sullivan, NH

Built 1972 Load: 41.8 t ADT: 10,644

I-93 NB

Fair

Over: SKOOKUMCHUCK BROOK

4 MI N. LINCOLN T.L., Grafton, NH

Built 1987 Load: 42.1 t ADT: 5,052

NH112

Fair

Over: HANCOCK BROOK

4.0 MI E OF LIVERMORE TL, Grafton, NH

Built 1938 Load: 42.1 t ADT: 3,061

NH 3A,BROWN AVE

Fair

Over: COHAS BROOK

1.2 MI S OF JCT I-193, Hillsborough, NH

Built 1986 Load: 42.1 t ADT: 16,175

JAMESTOWN ROAD

Fair

Over: WINNIPESAUKEE RIVER

AT BELMONT TOWN LINE, Belknap, NH

Built 1982 Load: 42.3 t ADT: 3,362

NH113

Fair

Over: SWIFT RIVER

1.2 MI NE JCT NH 25, Carroll, NH

Built 1987 Load: 42.3 t ADT: 2,216

MOO CORNERS RD

Fair

Over: OWL BROOK

200' OFF OWL BK RD, Grafton, NH

Built 1930 Load: 42.3 t ADT: 90

NH112,KANCAMAGUS

Fair

Over: E BR PEMIGEWASSET RIVER

3.8 MI EAST OF JCT 3A, Grafton, NH

Built 1938 Load: 42.3 t ADT: 3,061

US 4

Fair

Over: NHRR(ABD)

0.075 MI W.OF RTE. 11, Merrimack, NH

Built 1959 Load: 42.3 t ADT: 2,163

I-393,US 4,US202

Fair

Over: MERRIMACK RIVER

0.6 MI EAST OF JCT I-93, Merrimack, NH

Built 1978 Load: 42.3 t ADT: 39,922

NH 13

Fair

Over: TURKEY RIVER

2.75MI E BOW TL, Merrimack, NH

Built 1960 Load: 42.3 t ADT: 9,884

LEBANON STREET

Fair

Over: SALMON FALLS RIVER

NH.-ME. SL, Strafford, NH

Built 1920 Load: 42.3 t ADT: 684

J CONNOR ROAD

Fair

Over: PISCATAQUOG RIVER

0.18 MI FROM NH RTE 114, Hillsborough, NH

Built 2003 Load: 42.4 t ADT: 90

NH 16TRK, 12TH ST

Fair

Over: ANDROSCOGGIN RIVER

12TH ST BERLIN, Coos, NH

Built 1975 Load: 42.5 t ADT: 3,317

JEFFERSON NOTCH RD

Fair

Over: S BRANCH ISRAEL RIVER

1.3 MI S JEFFERSON TL, Coos, NH

Built 1939 Load: 42.5 t ADT: 90

BODWELL ROAD

Fair

Over: COHAS BROOK

0.1 MI E FROM I-93 NB, Hillsborough, NH

Built 1962 Load: 42.6 t ADT: 3,415

Showing 1,051-1,100 of 2,542 bridges

Related

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Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.

Understanding Bridge Conditions

How FHWA rates bridge condition on a 0-9 scale.

Check Your Daily Bridges

How to look up bridge condition data for bridges on your route.

Read our methodology — how this data is sourced, computed, and verified.